ポリ-N-ビニルカルバゾールにおけるExtrinsicキャリヤ生成機構:—CTけい光の電場による消光—

概要

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Field-induced CT fluorescence quenching has been observed in a poly-N-vinylcarbazole (PVCz) film doped with tetracyanobenzene (4CNB), which exhibits a large sensitized photocurrent in the corresponding CT absorption region. The CT fluorescence quenching has been found to be attributable to carrier photogeneration due to the "field-assisted thermal dissociation" of an ion pair which is produced from higher excited CT state as a precursor. Analysis in the framework of the Onsager's model for the dissociation process of an ion pair satisfactorily explains the experimental data of field-dependence and temperature-dependence of the fluorescence quenching by electric field. Combining with previously proposed mechanism of extrinsic carrier photogeneration in the exciplex systems, more general mechanism has been presented for the extrinsic carrier photogeneraion in a solid state of the excited donor-acceptor system.
The Imaging Society of Japanの論文